After surgery, how dangerous is it to eat too much, vomit and then continue eating?

A family member recently (5 months ago) had lapband surgery and doesn't seem to be following any particular diet guide line or exercise program. On a week long family outing, we noticed that she would eat regular portions of food, excuse herself from the table to go vomit, then come back and have dessert. When we expressed concern about this practice, she rationalized that the excess food had not been in her stomach, so there was no acid in the expelled food. She has other health issues and we're afraid that this could cause some severe consequences.

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